DVD player problem

[Autrob]

good guess.
if the player says in the display no disc, its probable your lens is defective.

if the player recognises the disc and tracks, but is unable to read it, your on the verge of a dying lense.
normally this problem starts after 3-5 years depending on the intensity of usage.
technically the lens can be exchanged but its possible, that there are no more spare parts.